Adjust libsanitizer to ABI change in glibc 2.31.

Adapted to 3.x from this upstream commit:
https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce

--- a/lib/sanitizer_common/saniniitizer_platform_limits_posix.h.orig	2020-08-11 16:01:32.494882282 +0200 #
+++ b/lib/sanitizer_common/sanitizer_platform_limits_posix.h	2020-08-11 16:32:49.711383554 +0200
@@ -176,8 +176,7 @@
     unsigned long __unused1;
     unsigned long __unused2;
 #else
-    unsigned short mode;
-    unsigned short __pad1;
+    unsigned int mode;
     unsigned short __seq;
     unsigned short __pad2;
 #if defined(__x86_64__) && !defined(_LP64)
--- a/lib/sanitizer_common/sanitizer_platform_limits_posix.cc	2020-08-11 16:01:07.926821829 +0200
+++ b/lib/sanitizer_common/sanitizer_platform_limits_posix.cc.orig	2020-08-11 16:01:03.698811421 +0200
@@ -1056,7 +1056,9 @@
 CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
+#if !SANITIZER_LINUX || __GLIBC_PREREQ (2, 31)
 CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
+#endif
 
 CHECK_TYPE_SIZE(shmid_ds);
 CHECK_SIZE_AND_OFFSET(shmid_ds, shm_perm);
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<tr><td><span title='2020-03-13 22:57:04 +0100'>2020-03-13</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=788425c2a8df0545fd31cb8ed4578ecb635739c3'>gnu: taglib: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-01-03 13:54:12 +0100'>2020-01-03</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=a96c00865aeba1c05b56822e6a0601dd81e85c67'>gnu: eyed3: Update to 0.8.12.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-12-28 12:44:15 +0100'>2019-12-28</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=2577d9341adb7e3533818cdff12b2080f4e622d2'>gnu: Add python-pyacoustid.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-12-28 12:44:15 +0100'>2019-12-28</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=8ce704b2b12bb7ecd8b12d7b091dc0f816591b8f'>gnu: Add python-audioread.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-11-11 04:50:29 +0100'>2019-11-11</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=1cb82fa4120d9e924305aced876f794ad3132fd9'>gnu: eyed3: Update to 0.8.11.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-27 15:20:12 +0100'>2019-10-27</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=eb28d9cf8d04e0df9d8025f91d836bba7a05eb82'>gnu: mpg123: Update to 1.25.13.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-13 13:07:44 +0200'>2019-10-13</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=b5f6700fb454edad46e84cc46edb3654e42b5172'>gnu: id3lib: Apply patch for UTF16 writing bug.</a><span class='msg-avail'>...</span></td><td>Pierre Langlois</td></tr>
<tr><td><span title='2019-08-30 23:10:20 +0200'>2019-08-30</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=7ef15fa378d0cc5d14a244f6f53ffe44c682f7c8'>gnu: mpg123: Update to 1.25.12.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-08-06 03:18:24 -0400'>2019-08-06</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=aac6c53a7bc9a8d22e88a490ebc99ec79d64a05b'>gnu: libmad: Add more security fixes from Debian.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>